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          每天进步一点点001-etcd
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        <h1 id="Preface"><a href="#Preface" class="headerlink" title="Preface"></a>Preface</h1><p>最近迷失了方向，所以每天强行学习一点点吧。</p>
<p>刚才总结了一下自己后续的规划，感觉以后可能是做点小生意，或者是写app的什么的，主要用golang，如果前端有可能的话，估计会用flutter。</p>
<p>今天就先从最近开始但是尚未结束的etcd开始吧，算是摸索和入门</p>
<h1 id="Content"><a href="#Content" class="headerlink" title="Content"></a>Content</h1><h2 id="Docker安装单节点etcd"><a href="#Docker安装单节点etcd" class="headerlink" title="Docker安装单节点etcd"></a>Docker安装单节点etcd</h2><h3 id="Docker-etcd官方推荐运行方式"><a href="#Docker-etcd官方推荐运行方式" class="headerlink" title="Docker/etcd官方推荐运行方式"></a>Docker/etcd官方推荐运行方式</h3><figure class="highlight yaml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="string">docker</span> <span class="string">run</span> <span class="string">\</span></span><br><span class="line">  <span class="string">-d</span> <span class="string">\</span></span><br><span class="line">  <span class="string">-p</span> <span class="number">2379</span><span class="string">:2379</span> <span class="string">\</span></span><br><span class="line">  <span class="string">-p</span> <span class="number">2380</span><span class="string">:2380</span> <span class="string">\</span></span><br><span class="line">  <span class="string">-p</span> <span class="number">4001</span><span class="string">:4001</span> <span class="string">\</span></span><br><span class="line">  <span class="string">-p</span> <span class="number">7001</span><span class="string">:7001</span> <span class="string">\</span></span><br><span class="line">  <span class="string">-v</span> <span class="string">/data/backup/dir:/data</span> <span class="string">\</span></span><br><span class="line">  <span class="string">--name</span> <span class="string">some-etcd</span> <span class="string">\</span></span><br><span class="line">  <span class="string">elcolio/etcd:latest</span> <span class="string">\</span></span><br><span class="line">  <span class="string">-name</span> <span class="string">some-etcd</span> <span class="string">\</span></span><br><span class="line">  <span class="string">-discovery=https://discovery.etcd.io/blahblahblahblah</span> <span class="string">\</span></span><br><span class="line">  <span class="string">-advertise-client-urls</span> <span class="string">http://192.168.1.99:4001</span> <span class="string">\</span></span><br><span class="line">  <span class="string">-initial-advertise-peer-urls</span> <span class="string">http://192.168.1.99:7001</span></span><br></pre></td></tr></table></figure>

<p>需要注意的是，这里的discovery需要自己去调用官方提供的公共服务来获得自己特有的discovery，随便填会随便报错。当然，有条件的话你搭建自己的发现服务也可以：</p>
<figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">curl https://discovery.etcd.io/new?size=3</span><br></pre></td></tr></table></figure>



<h3 id="Code"><a href="#Code" class="headerlink" title="Code"></a>Code</h3><p>最近是在看go语言高级编程看到这一节才想起之前搭建etcd集群一直都是失败的，测试代码如下：</p>
<figure class="highlight go"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> advanced_go</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> (</span><br><span class="line">	<span class="string">&quot;fmt&quot;</span></span><br><span class="line">	<span class="string">&quot;github.com/zieckey/etcdsync&quot;</span></span><br><span class="line">)</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">func</span> <span class="title">GoEtcd</span><span class="params">()</span></span>  &#123;</span><br><span class="line">	m,err := etcdsync.New(<span class="string">&quot;/lock&quot;</span>,<span class="number">10</span>,[]<span class="keyword">string</span>&#123;<span class="string">&quot;http://192.168.2.91:2379&quot;</span>&#125;)</span><br><span class="line">	<span class="keyword">if</span> m == <span class="literal">nil</span> || err != <span class="literal">nil</span> &#123;</span><br><span class="line">		fmt.Printf(<span class="string">&quot;etcdsync.New failed.\n %v \n&quot;</span>,err)</span><br><span class="line">		<span class="keyword">return</span></span><br><span class="line">	&#125;</span><br><span class="line">	err = m.Lock()</span><br><span class="line">	<span class="keyword">if</span> err != <span class="literal">nil</span> &#123;</span><br><span class="line">		fmt.Printf(<span class="string">&quot;etcdsync.Lock failed.\v %v \n&quot;</span>,err)</span><br><span class="line">		<span class="keyword">return</span></span><br><span class="line">	&#125;</span><br><span class="line">	fmt.Println(<span class="string">&quot;etcdsync.Lock OK&quot;</span>)</span><br><span class="line">	fmt.Println(<span class="string">&quot;Get the lock. Do something here.&quot;</span>)</span><br><span class="line"></span><br><span class="line">	err = m.Unlock()</span><br><span class="line">	<span class="keyword">if</span> err != <span class="literal">nil</span> &#123;</span><br><span class="line">		fmt.Printf(<span class="string">&quot;etcdsync.Unlock failed.\n %v \n&quot;</span>,err)</span><br><span class="line">	&#125;<span class="keyword">else</span> &#123;</span><br><span class="line">		fmt.Println(<span class="string">&quot;etcdsync.Unlock OK&quot;</span>)</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>

<p>测试结果如下：</p>
<blockquote>
<p>etcdsync.Lock failed. client: endpoint <a target="_blank" rel="external nofollow noopener noreferrer" href="http://192.168.2.91:2379">http://192.168.2.91:2379</a> exceeded header timeout </p>
</blockquote>
<p>使用 docker inspect看到的state部分的状况如下：</p>
<figure class="highlight json"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line">&quot;State&quot;: &#123;</span><br><span class="line">            &quot;Status&quot;: &quot;exited&quot;,</span><br><span class="line">            &quot;Running&quot;: false,</span><br><span class="line">            &quot;Paused&quot;: false,</span><br><span class="line">            &quot;Restarting&quot;: false,</span><br><span class="line">            &quot;OOMKilled&quot;: false,</span><br><span class="line">            &quot;Dead&quot;: false,</span><br><span class="line">            &quot;Pid&quot;: 0,</span><br><span class="line">            &quot;ExitCode&quot;: 1,</span><br><span class="line">            &quot;Error&quot;: &quot;&quot;,</span><br><span class="line">            &quot;StartedAt&quot;: &quot;2019-11-20T03:21:47.165684657Z&quot;,</span><br><span class="line">            &quot;FinishedAt&quot;: &quot;2019-11-20T03:22:49.476739053Z&quot;</span><br><span class="line">        &#125;,</span><br><span class="line"></span><br></pre></td></tr></table></figure>

<p>运行docker logs my-etcd看到如下如下结果：</p>
<blockquote>
<p>Using default CLIENT_URLS (<a href="http://0.0.0.0:4001,http://0.0.0.0:2379" rel="external nofollow noopener noreferrer" target="_blank">http://0.0.0.0:4001,http://0.0.0.0:2379</a>)<br>Using default PEER_URLS (<a href="http://0.0.0.0:7001,http://0.0.0.0:2380" rel="external nofollow noopener noreferrer" target="_blank">http://0.0.0.0:7001,http://0.0.0.0:2380</a>)<br>Running ‘/bin/etcd -data-dir=/data -listen-peer-urls=<a href="http://0.0.0.0:7001,http://0.0.0.0:2380" rel="external nofollow noopener noreferrer" target="_blank">http://0.0.0.0:7001,http://0.0.0.0:2380</a> -listen-client-urls=<a href="http://0.0.0.0:4001,http://0.0.0.0:2379" rel="external nofollow noopener noreferrer" target="_blank">http://0.0.0.0:4001,http://0.0.0.0:2379</a> -name my-etcd -discovery=<a target="_blank" rel="external nofollow noopener noreferrer" href="https://discovery.etcd.io/0db6471c7333720cec321f6e85f3c1e8">https://discovery.etcd.io/0db6471c7333720cec321f6e85f3c1e8</a> -advertise-client-urls <a target="_blank" rel="external nofollow noopener noreferrer" href="http://192.168.2.91:4001">http://192.168.2.91:4001</a> -initial-advertise-peer-urls <a href="http://192.168.2.91:7100&#39;" rel="external nofollow noopener noreferrer" target="_blank">http://192.168.2.91:7100&#39;</a><br>BEGIN ETCD OUTPUT<br>2019/11/20 03:21:47 etcd: listening for peers on <a target="_blank" rel="external nofollow noopener noreferrer" href="http://0.0.0.0:2380">http://0.0.0.0:2380</a><br>2019/11/20 03:21:47 etcd: listening for peers on <a target="_blank" rel="external nofollow noopener noreferrer" href="http://0.0.0.0:7001">http://0.0.0.0:7001</a><br>2019/11/20 03:21:47 etcd: listening for client requests on <a target="_blank" rel="external nofollow noopener noreferrer" href="http://0.0.0.0:2379">http://0.0.0.0:2379</a><br>2019/11/20 03:21:47 etcd: listening for client requests on <a target="_blank" rel="external nofollow noopener noreferrer" href="http://0.0.0.0:4001">http://0.0.0.0:4001</a><br>2019/11/20 03:21:47 etcdserver: datadir is valid for the 2.0.1 format<br>2019/11/20 03:21:49 discovery: found self c482fe336fe84311 in the cluster<br>2019/11/20 03:21:49 discovery: found 1 peer(s), waiting for 2 more<br>2019/11/20 03:22:49 etcd: stopping listening for client requests on <a target="_blank" rel="external nofollow noopener noreferrer" href="http://0.0.0.0:4001">http://0.0.0.0:4001</a><br>2019/11/20 03:22:49 etcd: stopping listening for client requests on <a target="_blank" rel="external nofollow noopener noreferrer" href="http://0.0.0.0:2379">http://0.0.0.0:2379</a><br>2019/11/20 03:22:49 etcd: stopping listening for peers on <a target="_blank" rel="external nofollow noopener noreferrer" href="http://0.0.0.0:7001">http://0.0.0.0:7001</a><br>2019/11/20 03:22:49 etcd: stopping listening for peers on <a target="_blank" rel="external nofollow noopener noreferrer" href="http://0.0.0.0:2380">http://0.0.0.0:2380</a><br>2019/11/20 03:22:49 etcd: unrecognized HTTP status code 502</p>
</blockquote>
<p>也就是启动就成功，我了个大槽，先放着。</p>
<h1 id="Reference"><a href="#Reference" class="headerlink" title="Reference"></a>Reference</h1><ul>
<li><a target="_blank" rel="external nofollow noopener noreferrer" href="https://hub.docker.com/r/elcolio/etcd">Docker hub/elcolio/etcd</a></li>
<li><a target="_blank" rel="external nofollow noopener noreferrer" href="https://github.com/etcd-io/etcd/blob/master/Documentation/v2/clustering.md#public-etcd-discovery-service">cluter/public-etcd-discovery-service</a></li>
</ul>
<h1 id="PS"><a href="#PS" class="headerlink" title="PS"></a>PS</h1><p>docker image在docker hub都有详细说明，所以仔细阅读就可以了，不能心急</p>
<h1 id="Problem"><a href="#Problem" class="headerlink" title="Problem"></a>Problem</h1><h2 id="无法启动etcddocker服务的bug"><a href="#无法启动etcddocker服务的bug" class="headerlink" title="无法启动etcddocker服务的bug"></a>无法启动etcddocker服务的bug</h2><p>我所使用的是 <a target="_blank" rel="external nofollow noopener noreferrer" href="https://hub.docker.com/r/elcolio/etcd">elcolio/etcd</a>，<br>dockerhub上可以找到他的github地址<a target="_blank" rel="external nofollow noopener noreferrer" href="https://github.com/colebrumley/docker-etcd">colebrumley/docker-etcd</a>,<br><a target="_blank" rel="external nofollow noopener noreferrer" href="https://github.com/colebrumley/docker-etcd/issues/1">Can’t start service</a>。<br>其实困扰了很久的问题只是服务发现的地址过期了，重新刷一个地址填进去就可以了。</p>

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